Hypodermic syringe construction



L. RRESNICK ETAL 2,523,330

HYPODERMI SYRI'NGE CONSTRUCTION Sept. 26, 1950 Filed Jan. 5, 1948 IN V EN TOR!)` @TTU/@MEV Patented Sept. 26, 1950 HYPODERMIC SYRINGE CONSTRUCTION Leo Paul Resnick `and Elmer C. Gordon, Los Angeles, Calif.; Henrietta C. `Gordon administratrixfof said Elmer C. Gordon, deceased Application January 5, 1948, Serial No. 626

3 Claims. l

Our invention relates to a syringe for use in applying subcutaneous medication.

Inasmuch as the tip-s of the syringe barrels are delicate and fragile, many of them become broken accidentally in every hospital and then discarded.

Where a very great number of these breakages occur, the cost of replacement with new ones is considerable. Unless the breakage of the tip end of the barrel involves a fracture or other serious damage to the barrel itself, in which event the entire unit must be laid aside, these barrels, intact per se, with their plungers, may be made available for further and continued use, and one of the chief objects of this invention is to provide simple and efficient means, the use of which will enable these barrels with their broken tips to be repaired and reconstructed to present a sturdy, strong, neat, and easily sterilized device.

Another object of the invention is to provide a metallic tip structure for glass barrels f syringes which, when assembled, will constitute an integral part thereof and will form a firm anchorage for hyprodermic needles.

Other objects will appear from the specification following, in connection with the accompanying drawing, which represents a preferred form of embodiment of the invention, and in which:

Fig. 1 is an enlarged elevational sectional view of the glass barrel of a hypodermic syringe and the plunger therein, showing a fractured or broken tip; and

Fig. 2 is an enlarged, sectional view showing the tip structure of our invention as applied to a barrel from which the tip has been removed.

Referring particularly to Fig. 2, the tip there shown represents a unitary structure which may constitute either an original embodiment, or a syringe barrel repaired in accordance with our invention; in the former the barrel is not provided with a tip integral with the barrel, while in the latter, the tip that has suffered damage untting it for further use, has been removed, s0 that application of the new unit to produce a completed syringe structure is made directly to the end of the barrel to form a permanent part thereof for the life or period of usefulness of the barrel, but removable from a brokenbarrel and applicable to another. l Y

In Fig. 1, a barrel I is shown, in which is operable a plunger 2. The cylinder or barrel I has the usual end wall 3 that is provided substantially centrally thereof with a forwardly projecting tip 4 having an axial bore E. Over this tip a the end of a hypodermic needle is adapted to be pressed.

(Cl. 12S-*218) It is this tip which is frequently and-readily susceptible to breakage, and where such breakage occurs as and where shown in the drawing, or

even closer to the end Wall 3 of the 'barrel I, without embracing such end wall or port of the barrel, the barrel or cylinder may be restored to original hypoderinic use, by securing to said wall a metallic tip fi. For this purpose, the middle portion of the end wall v3 carrying the tip 4 is cut ofi substantially in the plane of the outer face of the wall 3, with a suitable tool so as to leave an annular, inwardly projecting iiange 'I encircling a central port or opening 8 which may be reamed to enlarge same if necessary, and adapt it to receive said tip 6. This tip 6 comprises a shank body 9 having external threads I0, a diametrically enlarged head II preferably of disk form, and a tapering portion I2 at the other end for receiving and frictionally or otherwise holding a hypodermic needle in position for use. The shank 9 and tapering portion I2 of the tip are bored to provide a continuous passageway I3 therethrough, which communicates at one end with the interior of the barrel and at the other end with the bore through the needle, not shown.

The disk I I is provided with annular means for retaining a sealing medium; for this purpose it is preferably peripherally flanged at I 4 to provide an inverted cup, which, when the tip 5 is introduced into the open end of the barrel from which the plunger has been removed, and passed through the port 0r opening 8, rests upon the inner face of the end wall 'I and co-operates therewith to form an annular chamber I5 adapted to contain a sealing medium or compound for rendering Huid-tight the associated parts. A nut I6 threadedly engages the shank body 9 and the part of the nut adjacent the outer face of the end wall is flanged or dished as at I1, to provide a cup, which, when the nut is turned to engagement with the end wall, co-operates therewith to form a chamber i3 for a sealing medium or compound, the disk II being forced into secure engagement with the inner face of the end Wall as the nut is manipulated to engage the outer face of the end wall. In this wise, the sealing medium, of whatever nature, is compressed and effectively renders the connection uid-tight between the tip and barrel.

It will be observed, as' stated, that the tip 6 is applicable to a special type of barrel to provide a new article of manufacture, or to the repair of a barrel the tip of which is broken or damaged, and that this reconditioning and restoration to use of a damaged barrel may be effected rapidly and at a considerable saving of time and expense, to provide a syringe with a tip equipment capable of withstanding hard usage and even abuse.

The invention is susceptible to many modifications and changes without involving any departure from the sense of the invention as eX- pressed in the claims.

What We claim is:

1. A hypodermic syringe comprising a cylindrical body having an end Wall with an opening therethrough, a metallic shank extending through said opening and having a bore extending through the same, said shank having a tapered outer end to receive a needle, said shank having an inner head seating against the inner face of the end wall, said inner head having annular means for retaining a sealingmedium between it and the face of the Wall; said shank having a thread, and a nut on said thread seating against the outer face of said end Wall operating when tightened up, to compress the sealing medium against the inner face of said end wall.

2. A hypodermic syringe comprising a cylindrical chamber having a ported end wall, a bored metallic shank extending through the port in said end Wall and provided with a needle-receiving tip at one end and an inverted cup at the other end for a sealing medium, and a sealing medium containing cup adjustable on said shank and cooperating with said inverted cup to seal said shank in fluid-tight engagement with said end Wall.

3. A device of the character disclosed, comprising a bored needle-receiving-and-holding tip, having chambers for engaging the barrel end 0f a hypodermic syringe and containing a sealing medium, one of said chambers being adjustable on said shank and co-operating with the other chamber to effect a fluid-tight engagement of said shank with said barrel end.

LEO PAUL RESNICK. ELMER C. GORDON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name l Date 1,179,561 Reed Apr. 18, 1916 1,644,901 Stieglitz Oct. l1, 1927 2,444,982 Everett July 13, 1948 FOREIGN PATENTS Number Country Date 73,166 Switzerland Aug. 16, 1916 281,625 Great Britain Aug. 9, 1928 '766,110 France June 21, 1934 

